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        var money = prompt('请输入您带的钱数');
        if (money >= 2000) {
            alert('请大家吃西餐');
        } else if (money >= 1500) {
            alert('请大家吃快餐');
        } else if (money >= 1000) {
            alert('请大家喝饮料');
        } else if (money >= 500) {
            alert('请大家吃棒棒糖');
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            alert('班长带的钱太少了,下次把钱带够再来');
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